Pump jack



ocrn 221, 1929.

C. L. KENYON PUMP JACK Filed Oct. 5 1925 5 Sheets-Sheet Gvyon LKenyonGct. 22, 1929. c. L. KENYQN PUMP J ACK Filed Oct. 5, 1925 3 Sheets-Sheet2 u @mn l Clayton 1.KenXon @J atto: nu*

Patented Oct. 22, 1929 UNITED STATES PATENT OFFICE CLAYTON Li KENYON,OFMINNEAPOLIS, MINNESOTA, ASSIGNOR TO KENYON MANU- FACTURING COMPANY, OFMINNEAPOLIS, MINNESOTA, A CORPORATION OF DELA- WARE PUMP 'JACKApplication Vfiled October 5, `1925. Serial No. 60,468.

My invention relates to pump jacks and has for its object to provide ajack which may be rigidly secured to a pump proper so as to cause thesame to effectively function without lost motion.

Another object of the invention resides in providing a circular casingin which the operating mechanism of the invention is positioned so as tocompletely cover the same from the rain and weather and to provide anoil reservoir so that the mechanism may at all times operate in a bathof oil.

Another object resides in providing a T- shaped lever, `the stem ofwhich projects downwardly into the casing and is oscillated by means ofa crank pin mounted on a gear, while the cross bar thereof extendsoutwardly beyond the casing andis connected at one end 'to the pump Vrodand at its other end toa-n equalizing coil spring.

Another object of the invention resides in forming said casing with asector shaped opening to permit of inserting the main gear into the sameand to provide the oil reservoir at the bottom of the casing.

A still further object resides in forming said casing at the upperportionthereof with an opening through which the stein of said T- levermay be projected, and to offset the bar of said T from said stem and toprovide a cover for closing said opening.

Another object of the invention resides in providing a coil springattached to the cross arm of said T lever for the purpose of counterbalancing the action of the pump upon its return stroke.

A still further feature resides in providing oil pockets in the crosshead block to cushion the same along the guide way so asto reduce thewear of said cross head and guideway.

Other objects of the invention reside in the detailed constructionthereof as brought out in the following description, claims anddrawings. v

In the drawings illustrating my invention in one form:

Fig. 1 is a side elevational view of the de- Fig. 2 is a plan view ofthe structure shown in Fig. 1.

Fig. 3 is a sectional View taken on line 3 3 of Fig. 1.

Fig. 4 is an isometric view of the cross head of the invention.

My invention is adapted to be used in connection with pumps such asemployed for wells and cisterns and is arranged to operate the pump rodthereof in a manner well known in the art.

In the drawings I have illustrated a portion of the. standard of anordinary pump A which is supported upon the usual base 11. Such pumpsbeing well known in the art I have not` thought it necessary toillustrate the same in greater detail.

The invention proper consists of a casing B, which is circular information and has formed on it legs 12 and 13 by means of which the samemay be secured to a suitable support. i

The leg 12 is formed with an upstanding flange 14:, while the casingproper has a boss 15 issuing outwardly from it above said flange. Tothis flange and boss are bolted by means of bolts 16 and 17, a bracket18, which is formed with a V shaped neck 19, best illustrated in Fig. 2.This neck is adapted to lie adjacent the standard 10 of the pump A and aclamp member `of similar shape is positioned on the opposite sidethereof and attached toit by means of bolts 21. When the easing B issecured to the platform on `which the pump A rests and the bracket 18and clamp 20 rigidly bolted together toembrace the pump standard 10 itcanreadily be seen that the structure is securely and rigidly held inplace. Y I

At the upper end of the casing B is provided a transverse shaft 22,which is firmly secured in two bosses 23 and 24, formed in the casing B.This casing is arranged with a raised portion 25 near the boss 24 and adepressed portion 26 adjacent the boss 23, which depressed portion iscontinuous with the remaining circular part of the casing. Upon theshaft 22 is journalled a T-shaped lever indicated in its entirety at C,which comprises a horizontally positioned lever portion 27 issuing fromit at one end and a rearwardly extending arm` 28. The said T-shapedlever further includes a. depending guide arm 29 which, together withthe lever 27 and arm 28, are integrally connected to a boss 30journalled upon a shaft 22 between the bosses 23 and 24. It will benoted that the lever 27 and the arm 28 are in alignment and extendoutwardly beyond the casing along the depressed portion 26 thereof, 'andthat the depending guide' arm 29 extends through the opening in theraised portion 25 of the casing and into the interior thereof. y

Oscillating movement is imparted to the depending guide arm 29 in aman-ner to be presently described, which causes the lever 2 7 to beraised and lowered. This'lever is preferably formed with a yoke 34whi1chis connected to the usualbars 32 of the pump proper, which in turn arepivoted'to the pump rod 33 Vand cause the pump to function in theordinary manner.

.Upon the end o t-hearml 28 is formed a boss 3 5 throught which-looselypasses a pin 36, held in place by means of a nut and a locknut 38.Thisfpin has secured to it a coil spring 39, which in turn is secured atits other end to a 1ug`4, cast integral withthe leg 13 and the body ofthe casing proper.

' As the pumpoperates thespring 3 9 is caused to be elongated during thereturn stroke of theV pump which assists in raising the pumprod duringythe effective stroke,

' vtherebycausing. the device to'operate more smoothly and .produce theresults desired.

Within the casing B is positioned a spur .gear 41 journalledupon a stubshaft 42 which is mounted in a boss 43 formed in the center ofthecircular portion of they casing B.

This casing isfof such a size as to convenh ientlly' enclose the gear 41which travels but va short distance from the bottom of ythe same. At theupper end of the casing B vare vformed f' .twobearings 44 and 45 inwhich is'journalled a shaft 46 extending through Ythe deviceon onesideand which carries a pinion 47 meshing with the spur gear 41.This'pinion-, as will be noted, is arranged within an enlarged portion48 of the casing B so that the same and the gear 41 are completelyenclosed within t he casing. The gear 41 ispro-vided witha number ofbosses 49, 50 and 51 which are positioned be*- tweerr the spokes of saidgea-r and 'are'arranged at different distances 4from the center of theyshaft 42. A pin 52 lformed with a shoulder 5,3l is adapted.Vr to beinsertedninto the bores 54 of any of the bosses49, 50er 5 1 so asV toprotrude outwardly therefrom.

lThis pin may be secured in place upon said bosses by means o ffa nut 55s'crewableupon the end thereof. The pin 52 is journalled in itsprotruding position in a cross head block 56 shown in detailin Fig. 4.This block is bored at 57 to receive the pin 52 and slideslongitudinally along a rectangular guideway 58 formed along the guidearm 29. It can readily be comprehended that as the gear 41 is rotatedthe arm 29 and consequently the lever 27 are caused to be oscillatedbymeans of the cross head156 and the pin 52. It will further be noted thatthe pin 52 being closer to the shaft 22 during the upper half of therotation of gear 41 that the movement of the lever 27 is vmuch more'rapid than when the said pin is more remote from the Shaft 22 duringthe lower half of the rotation of gear 41.` This principle is utilizedin causing the device to operate smoothly by having the effective strokeof the pump occur while the pin 52 is remote from the shaft 22 and thereturn stroke occur when theA pin 52 is in close proximity to the shaft22. For closing the opening atthe raised portion y25 of casing B Iprovide a vdetachable closure 59 which is adapted to be secured to saidcasing by means of Vtfivo cap screws 60. This closure is arranged with awall G1 which fits around the boss 24 and with -a similar wall 62fitting around the boss 30 of the lever C. A similar wall 63 formed onthe casing proper fits along the under side of the boss 30 and meetswith a vwall 62 to form a water-tight enclosure for the interiormechanism of the jack. It will be noted that the depending guide arm 29and the lever -27 and arm 28 are offset in relation to one another so asto permit the walls 62 and G3 to fall between the same and to close theinterior of the casing with a tight joint. y

In assembling the invention the gear 41 is first slid into the casing Blthrough a segmental shaped opening 64 which is arranged in 'the upperportion of said casing leaving a wall .65 at the lower portion thereofcast'integral with the remainder of the casing, to form an oil reservoirindicated at 66 in Fig. 3. After the gear has been placed within thecasing the shaft 42 is passed vthrough the boss 43 and through a bushing71 in said gear where the same is held in place by a Cotter pin 72 and aset screw 7 3. The T-shaped lever C is next assembled by dropping theguide arm 29 through the opening at the raised port-ion 25 of casing Band sliding the same over the cross head 56 which is mounted 'upon lpin52. Afterthis has been 'properly positioned the shaft 22 is passedthroufr'h the bosses y23 and 24 and through bushings t74 and 75 in theboss i 30, said shaft being held in place by set screws 76 and 77. Theopening may be 'clodby a plate 67 secured to 'said easing 'by *means of'screws 168. The oil may be inserted inte the device by removing the cap59 and filling the same through the opening in `the raised portion 25 ofsaid casing. As the device is op* erated through a pulley 68 secured tothe protruding end of the shaft 46 or any other suitable means, the oilwithin the reservoir 66 is splashed about upon the interior mechanism ofthe jack causing the same to be at all times properly lubricated. Adrain 69 placed at the bottom of the casing B permits of draining theoil whenever it is desired.

To reduce the wear on the cross head block 56 I drill a number of holes7() along the sides of the same where they engage the walls of the guide58. As the device functions these holes which serve as pockets becomefilled with oil. As the gear 4l rotates the block 56 is thrown from sideto side of the guide 58 causing the oil retained within the pockets tobe squeezed out of the same and between the contacting surfaces, therebycushioning the shock imparted to said block for every stroke of the pumpand consequently reducing the wear of the guide and said cross headblock.

The invention is particularly advantageous in that the jack may berigidly secured to the pump proper so that no lost motion occurs due toloose fastening to the supporting platform. In addition the entireconstruction is completely enclosed in a weather proof casing so thatthe interior mechanism of the same is preserved. At the same time an oilreservoir is formed which will carry a sufcient quantity of oil to keepthe device properly lubricated at all times. The device may be readilyassembled without considerable difficulty and the casing proper may beconstructed of a single casting so as to reduce the cost of the same andto provide an integrally formed oil reservoir. The cushioning spring andthe arrangement of the mechanism for oscillating the lever arm cause the`jack to function in an eliicient manner with practically the samestress executed upon the return stroke as upon the effective strokethereby causingr the operating motor and jack to run smoothly andquietly.

Having described my invention in the form which I consider to representthe best embodiment thereof I desire to have it understood that theinvention may be constructed in ldifferent ways and put to uses otherthan those described wit-hin the scope of the following claims.

Claims:

l. A pump jack comprising a circular casing', a shaft mounted in theupper portion thereof, said casing having a raised portion formed withan opening therein and a depressed portion adjacent said raised aortion,a T-shaped lever journalled on said s aft having a cross bar portionarranged along the depressed portion of said casing outwardly therefromand a stem portion' protruding through said raised portion and into theinterior of said casing and a cap for closing the opening in said raisedportion of the casing.

2. A pump `iack comprising a casing, a shaft mounted in the upperportion of said casing, a lever, journalled upon said shaft positionedwholly without said casing, a depending guide arm secured to said 'leverin offset relation thereto projecting wholly within `said casi-ng, meansfor enclosing the upper' portion of said casing and means for actuatingsaid guide arm to oscillate said lever.

3. In combination witha pump jack having a guide bar, a cross head blockslidable along said `guide har, said cross head block being formed withtransverse pockets and means for freely discharging oil upon said crosshead block.

4L. A pump jack comprising a `casing having a raised portion formed withan opening therein and adepressed portion adjacent said raised portion,a pair `of bosses formed upon said casing adjacent said raised anddepressed portions, a shaft mounted between said bosses, a bosspositioned `between said bosses and journalled upon said shaft, saidlast named boss carrying a depending guide arm protruding into theinterior of the casing, a lever formed on said boss in offset relationto said guide arm land extending along the depressed portion of saidcasing on the exterior' of the device, said raised portion of saidcasing forming a` wall fitted around said last named boss between saiddepending guide arm and lever, a cap for closing the opening in saidraised portion having a wall meeting the wall of said raised portion,said cap surrounding the upper portion of said last named boss andforming a tight closure for said casing.

5. A pump ack comprising a substantially cylindrical casing having araised portion centrally positioned relative thereto at the upperportion thereof, a gear concentrically positioned within said casing, ashaft mounted in the raised portion of said casing, a lever pivoted onsaid shaft, said lever having two horizontal arms extending outwardlytherefrom in opposite directions and a vertical arm depending withinsaid casing, means operated by said gear for rocking said vertical arm,a counter balance connected to one of saidy horizontal arms, said otherhorizontal arm being arranged for connection to a pump rod.

6. A pump jack comprising a casing, having a wall, a lever pivotedthereto, said lever having a cylindrical portion concentric with itsaxis passing through said wall at right angles thereto, said leverhaving an arm connected with said cylindrical portion positionedeXteriorly of said casing on one side of said Wall, and being adapted tobe connected to a pump rod, said lever having another arm positionedinteriorly relative to said casing on the other side of said wall andconnected to said cylindrical portion, and means for oscillating saidsecond named arm.

7. A pump jack comprising a cylindrical casing, said casing having aportion extending upwardly above the periphery of the 'fici Y the otherarm, and means Within said cas- Ina-jor portion thereof to one side ofsaid casing, a lever pivoted to said casing, said lever having acylindrical portion concentric with its axis extending through saidraised portion of said casing, said lever having an arm positioned abovethe cylindrical portion of said casing adjacent said raised portion onthe exterior thereof adapted to be connected to a pump' rod and an arnipositioned lWithin said raised portion and interiorly in said casing,and lneans within said casing for rocking said arin.

8. A pump jack comprising a casing, a T'shaped lever pivoted to saidCasing suhstantially centrally thereof near its upper portion, saidlever having an arm extending to either side of said case Without thesame and a stein depending Within the case, one of said arms beingarranged for connection to a pump rod, a counter-balance connected toing for engaging said stem for operating said lever.

yIn testimony whereof I aiX lny signature.

CLAYTON L. KENYON.

